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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2cd85619fd55f8a9ae18ffe4cf12205aee9fe03ae658cc559bf2d6329ee6dca' 
  AND token = 'KZBE0Vfnq7/7BlsJOw7DhUz0OB6/lH29zpS1Bo5nZVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}